Ladder



Feb. 20, 19230 J. H. DWIGHT LADDER 2 sheets-sheet 1 Filed June 5, 1921 WITNESSES l/VYHVTOH .1 11 @Wlght A TTOR/VEYS Feb. 20, 1923.

J. H. DWIGHT LADDER Filed June 5, 1921 2 sheets-sheet 2 I WITNESSES ATTORNEYS Patented Feb. 26), 1923.

:PA T'QF CE,

I JAMES HoMEnnwIeH'r, OF-ATLANTA, GEORGIA; I

, Application filed June a,

To aZZ whom it may concern; o r

Be it known that I, JAMES DWIGHT, a citizen of the United States, and a resident of Atlanta, in the county of Fulton and State of Georgia, have invented certainfnew and useful Improvements in Ladde'rs, of which the following is a specification. I p

This invention relates to ladders and more particularly to the rungs of the same,

An important object of this invention is to provide a ladder rung which, may be readily and conveniently applied to the sidesbf a ladder. in sucha mannerthatthe loosening or loss of the rung is absolutely pre vented. i I j Afurther object of the invention is "to provide a ladder'rung which isiefficienndu rable in use'and cheap to manufacture] In the accompanying drawing forminga part of th1s applicatlon and lnuwhichllke Figure 6 is aside elevation illustrating the rung in its applied positiong-the view .il lus trating the stiles of the ladder in dotted lines.

Figure 7 is a detail sectionalview illustinting the means for slidably and pivotthe invention.

' ally connecting-a pair of arms embodied in a Figure 8 is a side elevation illustratingthe ladder rung in the position it occupies preparatory to looking or securing the same to the stiles ofthe ladder. i 3 s In the drawing thevnulnera l 5designates the body of the rung, whichbody is formed at its ends with L-shaped attachingportions' 6 adapted to flatlyjcontact withtwo sides of the side bars of the ladder. The

body 5 is formed with a longitudinal corrugation terminating in branches 8- in the attaching portions ;6; and the said branches terminate newardly directed teeth 1912i. 's'cfial No." 474324. v

formed at the ends of the "attaching portions 6. The teeth 9 are'forced into the stiles of the ladder so as to firmly attach the rung.

Thebody'owhich is of elongated formation is formed inwardly of the L-shaped at} taching portions 6 with laterally projecting brackets 10 terminating in downwardly directed apertured ears 11, to whicha pair of arms'12 are slidably connected. The end portions of thearms12'arecurved longitudinally and pointed to define claws 14; adapted to be forced into the'inner'faces of the side bars of the ladder by forcing theinner ends of the arms 12 downwardly. The numerals 15 designate longitudinal slots 7 formed in the claws 14; which slots receive pivot; pins 16 carried the downwardly directedfears 11. WYhen the inner endsof the arm's l'2 are forced downwardly by means to belater described; the claws 14 are moved outwardly so that' 'the pins are positioned n 'therearor' inner portions of the slots thereby llmlting the p downward movement "of the arms 12.

v As illustrated: in Figure the inner portions of the arms 12 'are formed with apertured ears 20 which receive a pivot element 21 whereby the inner portions of'the arms are pivota'lly connect'ed.-

arms 12 and are formed with downwardly directed attaching flange's' 24L securely connected' to the sidesof the arms by meansof rivets 25 or other suitable fasteningdevices. The tread plates 22 are also formed along their forwardlongi'tudi'nal edges with stop v fiariges 27 which extend over and engage the upper edge portion of the body 5"so as'to limit the downward movement of the'arms '12 and thereby relieve the" pivot element 21 of the weight of a person standingon the :irung; As illustrated particularly in Figure 1 the laterally projecting brackets 10 are extended upwardly or at an angle to the body 55o lthatthe tread, 'plates '22 will be arranged horizontally when "the ladder is supported in. an lnclinedpositlon. That is to say the tread plates 22 will not be inclined transversely I when the ladder is "supported gainst the side of a wall or the like.

1 a lfn orderto properly guide the tread plates 22 tothe position illustrated in Figure 2 the stop flanges 27 aregradually and uniformly decreased in thickness. toward; their a tree Tread plates 22 are 'inoun ted'iuponthe' .ingomeans to engageltheouter sides of the the. arms 12 into. bit'm th'efinner faces of the stiles, This'jmay'bie lapse of the round. The U-shaped member- 30 has side arms terminating um laterally projecting attaching lu'gs al" pivotally connected totheinner portions of the armslQ by-,-means', ofpivot",elements133I Thev hinge and bracing,member; 30', is as illii'stra'tedi in Fig re 5 of"'UPSha ed'dOrmatioaiamij egwesass meai'is tolimitjthe downward movement oi? the a dj acent-I portions of the armsjlil. The UPsliapedfmember30f is rmanently. pivoted-tat itsen'ds ,.to the arms 12 as indicatedatj33; Ijliavefoiindr in the use of the improved:rouncithat the n'ie 'i'l'b'er 30' serves as, a convenient means for. flin'iiting the downward movement, of the adjacent p'ortio 'isof .tlie'ari'is'i-1 i In' applying the; improved. rur'ig;- the. at,- taching 'p'ort'i'ossj 6 are arranged-mg? ppp'site sides .of th'e",stiles aii'idltlie ftread. p'lat's ae are. forced} downwardly; so", as}; to sdi tectfthe claws .1 1 and. auxiliar laws 34: carried by g, ei'igagemei'it] with readily; accoiiiplishedj by, standing? on]. the inner portions of Ttlie treadplates and. fforc- ,b'ers', having ftlieir' endsfori'ned. with. means to, engage: the stiles,, said body. being en- .gaged by said'ltreadmembers' and';limiting the, downward pivotal. movement, of? the same. i r

2.. A ladder; runga Qompl'lS1I1gab0dy havstiles of av ladder, arms movably, asso'ciated with. i said f body and haying, claws adapted to bite. into the inner sides'offtlie stilsnof therladdl, mamas lates; carried Iiby said arms and adaptedvlto eng geI the body whereby, to li'init the dom'nfw-trd"movement'offthe arms r 3. A, ladder: rung; comprising; a, rigid body havin itsi endsf fformjedlwith"attaching members and prorided adjacent said "attaching'; members with brackets; arms pivotally I andsliflably connected'ltoQs'aid bra clrietsi and s ter-minatingeinrciaws,and-arsed slate -tar ri'd lay-Barri arms l. A ladder rung comprising body formed with attaching members and brackets, arms pivot-ally and'slidably con-- nected to said brackets and terminiiiting in claws, and tread plates carried by said arms, S d treadrplates being formed with downwardly directed stop flanges engaging said body.

5. A ladder rung comprising a body formednvith attaching members and provided adjacent said attaching members with brackets,.- arms pivotally and slidably connected to saidbrackets and terminating in claws, treadl plzttes carried by said arms, anc'la combined bracing and hinge member connected to the inner portions of said arms and engaged by said tread plates.

6. A ladder rung comprising arms ha\' ing claws adaptedt'o biteinto the stiles of a ladder andfformed with slots, a body having brack'ets provided with pivot elements passed through said" slots, tread plates tes ri'gidly, connected to said arms-and h'a Ing downwardly directed stop flanges gradi'iall'y reduced in thickness toward-their freeedges and engagingsaid body, and a combined-bracingand hinge member of U- shap'eddormation pivoted to said arms and engaged by said tread plates;

7. A'ladder rung comprising a pair of pivota'lly connected arms adaptedto be arranged "between thestiles ofa ladder and having their terminal portions formed'with claws adapted for engaging the inner sides of the stiles, andmeans associated With the arms forembracing theouter sides oi' -the' stiles and limiting] the downward pivotal movement of the arms.

ladder rung comprising a pair of arms having their adjacent portions pivotallyc'on'nected, said arms being adapted for arrangement between the stiles of-a ladder andfhaiv'ing their terminal portions formed with claws adapted for engaging the inner sides of the stiles o't'a ladder,- and a. body having fconnection with said'arms and provided with means embracingthe outer sides of, the ladder, said body forming a means for limiting, the downward pivotal movement of the arms.

QF'A' ladder rung comprising a P i arms having. their adjacent portions pivota-llyconnected andtheir terminal portions formed with claws adapted for engaging the inner sides of the stiles of a ladder, a body having connection witlisaid arms and provided with means embracing the stiles of 'tlie'ladder, and tread plates connected to said (arms and engaging said body, whereby the downwardmovement of the arms is limited;

10$ A ladder'rung comprising a pair of arms having'their adjacent portions pivotally, connected: and their terminal portions formed with cnrved prongs adaptedto bite into the inner sides of the stiles of a ladder, means associated with the adjacent portions of the arms to prevent the adjacent portions of the arms from moving downwardly, be

yond a predetermined degree, and a body towhich said arms are slidably and pivotally connected.

11. A ladder rung comprising a body having teeth to engage the stiles of the lad der, arms 'movably associated with said body and having claws adapted to bite into the stiles of the ladder,- tread plates carried by said arms and adapted to engage the body whereby to limit the downward movement of the arms, and a combined hinge and bracing member connected to'the adjacent portions of the arms.

12. A ladder rung comprising a body adapted for arrangement between the stiles of a ladder and having means to engage the stiles, pivotally connected tread 1 members having their ends formed with means to engage the stiles, and a combined bracing and hinge member connected to the adjacent portions of said tread members, said body being engaged by said tread members and limiting the downward pivotal movement of thesame.

13. A ladder rung comprising a body adapted for arrangement between the stiles of a ladder and having means to engage the stiles, pivotally connected tread members having their ends formed with means to engage the stiles, said body being engaged by said tread members and limiting the downward pivotal movement of the same, and a combined hinge and bracing member arranged at the adjacent portions of said tread members, said tread members having sliding connection With-said body.

i JAMES HOMER DWIGHT. 

